Chemicals, plastics and rubber industries

Mass transfer of a solubilizate in a micellar solution and across an interface

Article Abstract:

The mass transfer rates of a solubilizate in a micellar solution and across an interface have been measured through a novel experimental setup. The mass transfer rates in these systems are very low and are very hard to measure. The methodology employed uses a spectrophotometer cuvette which measures the change in concentration as a function of the absorbance of the solution while the system moves towards equilibrium under diffusion. The diffusivity is calculated by solving the boundary value problem while the interfacial resistance is derived from the absorbance data.

The effect of solution pH on the structural conformation of lysozyme layers adsorbed on the surface of water

Article Abstract:

The effects of solution pH and ionic strength on the surface excess and layer thickness of lysozyme layers adsorbed at the air/water interface were studied by means of neutron reflection. All the specular signal arose from the protein layers due to all measurements being made in null reflecting water. Adsorption was found to reach a maximum at the protein isoelectric point of pH11 at the low ionic strength of 0.02 M. The results clearly showed that salt addition had screened the charges within lysozyme molecules.